API reference# Contents: Data DataLoader DataLoader PriceTimeSeries PriceTimeSeries Spread SpreadSeries SpreadSeries HedgeRatioEstimator HedgeRatioEstimator ConstantOLS ConstantOLS RollingOLS RollingOLS KalmanFilter KalmanFilterParams KalmanFilter KalmanFilterWithVelocity KalmanFilterWithVelocityParams KalmanFilterWithVelocity Signal Direction Direction Signal Signal SignalGenerator SignalGenerator ZScoreSignal ZScoreSignal RollingADFFilter RollingADFFilter Sizing PositionSizer PositionSizer LinearSizer LinearSizer InverseVolSizer InverseVolSizer Kelly sizers KellyTruncatedEntry KellyTruncatedExit KellyTruncatedBoth Backtest TransactionCosts TransactionCosts Trade Trade Portfolio Portfolio RiskMetrics RiskMetrics BacktestResult BacktestResult BacktestEngine BacktestEngine Research PairFinder PairFinder